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Dynamic plan method by utilizing polymer flooding technique to improve oil recovery

A dynamic programming, polymer technology, used in special data processing applications, instruments, climate change adaptation, etc.

Inactive Publication Date: 2012-04-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no domestic patent on the dynamic programming method of polymer flooding EOR.

Method used

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  • Dynamic plan method by utilizing polymer flooding technique to improve oil recovery
  • Dynamic plan method by utilizing polymer flooding technique to improve oil recovery
  • Dynamic plan method by utilizing polymer flooding technique to improve oil recovery

Examples

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example

[0091] Example: For the well group in Gudong 8th District of Shengli Oilfield, the well pattern of the reservoir model is a five-point well pattern. There are four injection wells and nine production wells. The well locations are as follows: figure 2 shown. The length, width and thickness of the reservoir are 421.02m, 443.8m and 14m respectively, and the pore volume of the reservoir is 5.8857×10 5 m 3 . The original water saturation is 0.35, the original oil saturation is 0.65, and the crude oil density is 950kg / m 3 , crude oil geological reserves of 363,400 tons. The reservoir is divided into grids according to the three directions of x, y, and z, and the number of grids is 20×20×3. The reservoir parameters and fluid property parameters are shown in Table 1 and Table 2. Each injection well adopts the same polymer injection scheme.

[0092] The initial conditions of the reservoir are determined by the static equilibrium initialization method, that is, the fluid is in a st...

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Abstract

Polymer flooding is an important tertiary oil recover technique, but the price of polymer is expensive, and the responding time is relatively lagged. In order to scientifically establish a development scheme and to obtain better economic benefit, the invention provides a polymer flooding development scheme optimization design method on the basis of the dynamic plan technique. The optimization of the polymer flooding scheme can be specifically described as a distributed parameter system dynamic plan problem with state and control inequality constraints. For a fixed slug length injection optimization problem, a numerical solving algorithm based on iteration dynamic plan is provided, a polymer flooding injection-production process is dispersed on the aspect of time and on the aspect of space, and error caused by the dispersion is compensated by utilizing an iteration method. For the injection optimized problem that the slug length is variable, an iteration dynamic plan numerical solving algorithm with variable monitor is provided, so the injection concentration and the slug length can be simultaneously optimized. The method is implemented in the well groups of Gudong eighth area of Shengli Oil Field, and the economic benefit of the polymer flooding is remarkably improved.

Description

1. Technical field [0001] The technology relates to industrial optimization technology, especially a dynamic programming method for polymer flooding to enhance oil recovery. 2. Background technology [0002] In today's world, using active water development technology, the oil recovery rate is about 30-60%, and there are still about 65-70% of the original oil reserves in the oil reservoir. Petroleum is a non-renewable energy source with limited reserves, so it is extremely urgent to enhance oil recovery. Experts and scholars at home and abroad have done a lot of research on this. Most developed countries attach great importance to and support enhanced oil recovery methods and basic research. It is well known that polymer flooding can greatly enhance oil recovery. In China, polymer flooding technology has also been studied in Dagang, Shengli, Daqing and other oil fields. [0003] The characteristics of polymer flooding, such as high investment, long production cycle and high...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCY02A10/40
Inventor 李树荣雷阳郭兰磊张晓东张强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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